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Cross-sections of roots from susceptible (YZ—a) and resistant (BM13H—b,c) G. arboreum seedlings 10 days after inoculation with BRR spores in sterile culture. Epidermal cells (arrowhead in a) and root hairs (arrows) are heavily colonized with dark fungal hyphae. (b,c) are different optical sections of the same root cross-section. Bar in a for a–c = 50 mm.
